This encounter was inspired by a prank Timothy Cain used to play in the MUD Darker Realms, where he would teleport cows who had similar dialogue into a friend's work room.[1] A similar joke is present in Blizzard's Diablo, when played with the Hellfire add-on.

Ed in Vault City may say that he could have heard his brahmin say "Moo, I say!", in reference to this special encounter.